<!DOCTYPE html>
<style>
  body {
    margin: 0;
  }

  iframe {
    display: block;
    width: 300px;
    height: 300px;
    position: absolute;
    background: white;
  }

  .i1 {
    top: 50px;
    left: 50px;
  }

  .i2 {
    top: 100px;
    left: 100px;
  }
</style>

<iframe class="i1" src="lipsum.html"></iframe>
<iframe class="i2" src="lipsum.html"></iframe>
